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Use of Psychrometers, Capacitive Sensors and Vapour Transfer Technique to Determine the Water Retention Curve of Compacted Bentonite

  • María Victoria VillarEmail author
  • Rubén Javier Iglesias
  • Carlos Gutiérrez-Álvarez
  • Gemma Campos
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

The FEBEX large-scale test simulating an underground repository of nuclear waste excavated in granite was dismantled after 18 years of operation. The engineered barrier between the heaters and the host rock consisted of compacted blocks of FEBEX bentonite which were retrieved during dismantling. The water content, dry density and suction of some of these blocks were measured at the laboratory and retention curves (WRC) were inferred from these values. The WRC of samples trimmed from the blocks was also determined using the vapour transfer technique. The results obtained with both methodologies were compared with the WRC obtained previously for the reference untreated FEBEX bentonite. The results are comparable, which indicates, on the one hand, that both methodologies give consistent results and, on the other, that the water retention capacity was not altered by 18 years operation under barrier conditions.

Keywords

Water Retention Capacity Water Retention Curve Capacitive Sensor Sulphuric Acid Solution Nuclear Waste Repository 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This work has been financed by the FEBEX-DP consortium and through the Annex XLII of the ENRESA-CIEMAT framework agreement. Part of the laboratory work was performed by J. Aroz and F.J. Romero.

References

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • María Victoria Villar
    • 1
    Email author
  • Rubén Javier Iglesias
    • 1
  • Carlos Gutiérrez-Álvarez
    • 1
  • Gemma Campos
    • 1
  1. 1.Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT)MadridSpain

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